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Title Transcription
セイナン ニホン オカヤマケン ヤナハラ チイキ ホクトウブ ノ ペルムケイ マイヅル ソウグン ト ヤクノ オフィオライト
Title Alternative
Permian Maizuru Group and Yakuno Ophiolitic Rocks in the Northeastern Part of Yanahara Area in Okayama Prefecture, Southwest Japan
File
language
eng
Author
Tokuoka, Takao
Watanabe, Teruo
Landis, Charles,A.
Pillai, D.Dhana.L.
Nishimura, Kouichi
Choi, Jung,Yill
Description
A Permian convergent margin rock suite is discussed on the basis of the results of precise mappmg at the junction area of the Maizuru and the Kozuki-Tatsuno Belts. Middle to Late Permian radiolarians have been discovered from both the Kozuki unit (argillite-meta volcanicsbeded chert) and the Maizuru Group (predominantly mudstones). The newly proposed Tonoshiki Formation is composed of sedimentary breccias interpreted as being derived mostly from the Yakuno Ophiolitic rocks. Lower Permian radiolarians have been discovered from mudstone intercalated in the Tonoshiki breccias. The fomation is regarded to have been deposited on the ophiolite. The Yakuno Ophiolitic rocks together with the Tonoshiki Formation may have constituted a volcanic arc system, separating the Maizuru and Kozuki basins in Middle Permian time. The Tonoshiki Formation can be compared with the Upper Permian Upukerora Formation of the Maitai Group from the South Island of New Zealand, which was derived predominantly from the underlying Dun Mountain Ophiolite.
Journal Title
Memoirs of the Faculty of Science, Shimane University
Volume
21
Start Page
189
End Page
208
ISSN
03879925
Published Date
1987-12-25
NCID
AN00108106
Publisher
島根大学理学部
Publisher Aalternative
The Faculty of Science, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Faculty of Science and Engineering